Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSJEEP1987COMANCHE LAREDO, 4.0 M, RWD, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEM2.5L TBI SYSTEM
1987 Jeep Comanche Laredo, 4.0 M, RWD, Automatic
2.5L TBI System
1987 Jeep Comanche Laredo, 4.0 M, RWD, AutomaticSECTION 2.5L TBI System
- Description
- Operation
- Notes
- Electronic Control Unit (Ecu)
- Sensors & Switches
- Exhaust Gas Oxygen (EGO) Sensor
- Manifold Air/Fuel Temperature (MAT) Sensor
- Coolant Temperature Sensor (CTS)
- Manifold Absolute Pressure (MAP) Sensor
- Knock Sensor
- Speed Sensor
- Battery Voltage
- Starter Motor Relay
- Wide Open Throttle (WOT) Switch
- Closed Throttle (Idle) Switch
- Transmission Gear Position Indicator
- Power Steering Pressure Switch
- A/C Switch
- Fuel Control
- Emission Control
- Idle Speed Actuator (ISA)
- Ignition Advance Control
- Ecu-Controlled Relays
- Up-Shift Indicator Lamp
- Modes Of Operation
- Component Testing
- System Diagnosis
- Preliminary Checks
- Diagnostic Test Charts
- Chart 1, Ignition Switch Off
- Chart 2-A, Ignition Switch On
- Chart 2-B, Ignition Switch On (Cont.)
- Chart 2-C, Ignition Switch On (Cont.)
- Chart 3, Throttle Position Sensor Test
- Chart 4-A, System Operational Test
- Chart 4-B, System Operational Test (Cont.)
- Chart 4-C, System Operational Test (Cont.)
- Chart 4-D, System Operational Test (Cont.)
- Chart 4-E, System Operational Test (Cont.)
- Chart 4-F, System Operational Test (Cont.)
- Chart 4-G, System Operational Test (Cont.)
- Chart 4-H, System Operational Test (Cont.)
- Chart 4-I, System Operational Test (Cont.)
- Chart 4-J, System Operational Test (Cont.)
- Chart 4-K, System Operational Test (Cont.)
- Chart 5, Basic Engine Test
- Chart 6-A, Man. Trans. Up-Shift Test
- Chart 6-B, Man. Trans. Up-Shift Test (Cont.)
- Removal & Installation
- Throttle Body Assembly
- Fuel Injector
- Fuel Pressure Regulator
- Idle Speed Actuator (ISA), Motor & Wide Open Throttle (Wot) Switch
- Electronic Control Unit
- Oxygen Sensor
- Manifold Air Temperature (Mat) & Manifold Absolute Pressure (Map) Sensors
- Coolant Temperature Sensor (Cts)
- EGR Valve & Canister Purge Solenoid
- Adjustments
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.